I'm pretty sure they were - our own Dana had one for a number of years, furthermore - back when I was in high school I did work experience at an AASP, and we had a Quadra 900/950 come in that had had a WGS9150 logic board upgrade.
Either way...nice score. The WGS9150's never been a common machine...so to find not just one, but two...is something. :O